Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
nhung cong » dung cong, thong cong, nhung don
hanh tang » hanh trang, anh tang, hanh mang
hang cong » dang cong, hang nong, bang cong
tang cua » mang cua, hang cua, tang luan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien thanh) or (tieng anh)) - hanh tang cua ((nhung cong) OR (hang cong)) dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien thanh) OR (tieng anh)) - hanh tang cua ((nhung cong) OR (hang cong)) dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien thanh) or (tieng anh)) - hanh tang cua ((nhung cong) OR (hang cong)) dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien thanh) or (tieng anh)) - hanh tang cua ((nhung cong) OR (hang cong)) dan toan cau*.